Add solution for Challenge 19 by shansing

[shansing]

Challenge 19 Solution

Submitted by: @shansing
Challenge: Challenge 19

Description

This PR contains my solution for Challenge 19.

Changes

• Added solution file to challenge-19/submissions/shansing/solution-template.go

Testing

• Solution passes all test cases
• Code follows Go best practices

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📥 Commits

Reviewing files that changed from the base of the PR and between a7ac764 and 6d2f659.

📒 Files selected for processing (1)

• challenge-19/submissions/shansing/solution-template.go

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